InvalidOperationException when adding or removing a Playlist through the Spotify app

[ChrisBrandhorst]

Situation:

• Spotify app is running;
• Using SpotiFire to connect to Spotify.

Action:

• Add to or remove a playlist from the account through the Spotify app;

Result:

An unhandled exception of type 'System.InvalidOperationException' occurred in mscorlib.dll

Additional information: An attempt was made to transition a task to a final state when it had already completed.

Stack:

    [External Code] 
>   SpotiFire.Native.dll!SpotiFire::PlaylistContainer::complete() Line 154  C++
    SpotiFire.Native.dll!$WaitCallback0::Callback(System::Object^ state) Line 159   C++
    [External Code] 

[Alxandr]

This should probably be a problem in one of the playlist callbacks.